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Case Reports in Orthopedics
Volume 2015, Article ID 120796, 5 pages
Case Report

Atraumatic Anterior Dislocation of the Hip Joint

1Department of Orthopedic Surgery, Tokyo Women’s Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan
2Department of Radiology, Tokyo Women’s Medical University, Tokyo 162-8666, Japan

Received 29 September 2015; Accepted 2 December 2015

Academic Editor: Wolfram Steens

Copyright © 2015 Tadahiko Ohtsuru et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dislocation of the hip joint in adults is usually caused by high-energy trauma such as road traffic accidents or falls from heights. Posterior dislocation is observed in most cases. However, atraumatic anterior dislocation of the hip joint is extremely rare. We present a case of atraumatic anterior dislocation of the hip joint that was induced by an activity of daily living. The possible causes of this dislocation were anterior capsule insufficiency due to developmental dysplasia of the hip, posterior pelvic tilt following thoracolumbar kyphosis due to vertebral fracture, and acetabular anterior coverage changes by postural factor. Acetabular anterior coverage changes in the sagittal plane were measured using a tomosynthesis imaging system. This system was useful for elucidation of the dislocation mechanism in the present case.